Hey, I'm relatively new to the scene (been brewin' for about 4 months). I just made a Munich Dunkel lager recipe and it's still at the same O.G. 4 days later. There was a bunch of foam and what looked like chunks of yeast that I stirred up when checked the gravity, but fermentation doesn't seemed to have started yet.

Jeff,
You need to provide more information on how you prepared/ pitched the yeast and the temp you are fermenting at. I always proof my yeast 2 to 3 days prior to brewing so that I get yeast that is ready for action on brew day. As a side note, lagers take twice the amount of yeast that ales take.
Also what was your gravity reading and what type of yeast are you using?